// SPDX-License-Identifier: GPL-2.0

/* This file is part of Lustre, http://www.lustre.org/ */

#ifndef LNET_RDMA_H
#define LNET_RDMA_H

#define REGSTR2(x) x##_register_nvfs_dma_ops
#define REGSTR(x)  REGSTR2(x)

#define UNREGSTR2(x) x##_unregister_nvfs_dma_ops
#define UNREGSTR(x)  UNREGSTR2(x)

#define MODULE_PREFIX lustre_v1

#define REGISTER_FUNC REGSTR(MODULE_PREFIX)
#define UNREGISTER_FUNC UNREGSTR(MODULE_PREFIX)

struct device;
struct page;
enum dma_data_direction;
struct scatterlist;

struct nvfs_dma_rw_ops;

int REGISTER_FUNC(struct nvfs_dma_rw_ops *ops);
void UNREGISTER_FUNC(void);

unsigned int lnet_get_dev_prio(struct device *dev,
			       unsigned int dev_idx);
int lnet_rdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
			   int nents, enum dma_data_direction direction);
int lnet_rdma_unmap_sg(struct device *dev,
		       struct scatterlist *sg, int nents,
		       enum dma_data_direction direction);
bool lnet_is_rdma_only_page(struct page *page);
unsigned int lnet_get_dev_idx(struct page *page);

/* DMA_ATTR_NO_WARN was added to kernel v4.8-11962-ga9a62c9 */
#ifndef DMA_ATTR_NO_WARN
#define DMA_ATTR_NO_WARN 0
#endif

#endif /* LUSTRE_NVFS_H */